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Abstract:

Analysis of seismic lines and gravity data shows the existence of Quaternary extensional depocenters beneath thick covers of < 1 Ma-old volcanic rocks in the Tromen volcanic plateau backarc region (36°40′-37°30′S). Dating and mapping of pre- and post-extensional volcanic units and structure in this area indicate that the main phase of crustal collapse developed during the 1.7-0.7 Ma time interval. However, Late Quaternary reactivations of the extensional structure show that this process is still going on, perhaps with decreasing intensity. Moreover, identification of "mechanical" rift zones and a potentially related main thermal anomaly leads to propose that an east-dipping detachment exists beneath the Late Cretaceous-Late Miocene fold and thrust belt, controlling the crustal collapse at these latitudes. The southernmost Central Andes (35°-37°30′S) have undergone a period of shallow subduction from ~ 13 to ~ 5 Ma, that led to expansion of the arc toward the foreland, generation of ductile-fragile crustal transitions, and subsequent foreland imbrications more than 550 km away from the trench. This framework shifted to a normal Andean subduction type after ~ 5 Ma, and the arc front re-established in the present western position. The consequences of this readjustment were: a) widespread volcanic eruptions of intra-plate melts in the eastern backarc (foreland plateau flows), and b) a major trough formed between the arc front and the foreland plateau basalts (Las Loicas trough). This extensional basin controlled the emplacement of crustal melts as well as primary mantle-derived products, well represented in the Tromen volcanic plateau. © 2008 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Crustal collapse in the Andean backarc since 2 Ma: Tromen volcanic plateau, Southern Central Andes (36°40′-37°30′S)
Autor:Folguera, A.; Bottesi, G.; Zapata, T.; Ramos, V.A.
Filiación:Laboratorio de Tectónica Andina, Departamento de Ciencias Geológicas, FCEyN, Pabellón 2, Ciudad de Buenos Aires, Argentina
YPF S.A., Dirección de Exploración y Desarrollo de Negocios, Faja Plegada Argentina, Av. Roque Saenz Peña 777, 777 Ciudad de Buenos Aires, Argentina
YPF S.A., Dirección de Exploración y Desarrollo de Negocios, Exploración onshore, Talero 360 Neuquén, Argentina
Palabras clave:Backarc extension; Backarc volcanism; Neotectonics; Southern Central Andes; Tectonic collapse; backarc basin; detachment fault; fold and thrust belt; foreland basin; neotectonics; subduction; volcanism; Andes; Argentina; Neuquen; South America; Tromen Volcano
Año:2008
Volumen:459
Número:1-4
Página de inicio:140
Página de fin:160
DOI: http://dx.doi.org/10.1016/j.tecto.2007.12.013
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v459_n1-4_p140_Folguera

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Citas:

---------- APA ----------
Folguera, A., Bottesi, G., Zapata, T. & Ramos, V.A. (2008) . Crustal collapse in the Andean backarc since 2 Ma: Tromen volcanic plateau, Southern Central Andes (36°40′-37°30′S). Tectonophysics, 459(1-4), 140-160.
http://dx.doi.org/10.1016/j.tecto.2007.12.013
---------- CHICAGO ----------
Folguera, A., Bottesi, G., Zapata, T., Ramos, V.A. "Crustal collapse in the Andean backarc since 2 Ma: Tromen volcanic plateau, Southern Central Andes (36°40′-37°30′S)" . Tectonophysics 459, no. 1-4 (2008) : 140-160.
http://dx.doi.org/10.1016/j.tecto.2007.12.013
---------- MLA ----------
Folguera, A., Bottesi, G., Zapata, T., Ramos, V.A. "Crustal collapse in the Andean backarc since 2 Ma: Tromen volcanic plateau, Southern Central Andes (36°40′-37°30′S)" . Tectonophysics, vol. 459, no. 1-4, 2008, pp. 140-160.
http://dx.doi.org/10.1016/j.tecto.2007.12.013
---------- VANCOUVER ----------
Folguera, A., Bottesi, G., Zapata, T., Ramos, V.A. Crustal collapse in the Andean backarc since 2 Ma: Tromen volcanic plateau, Southern Central Andes (36°40′-37°30′S). Tectonophysics. 2008;459(1-4):140-160.
http://dx.doi.org/10.1016/j.tecto.2007.12.013